/*
 * Copyright 2005-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.ldap.control;

import javax.naming.ldap.PagedResultsControl;
import java.util.Arrays;

/**
 * Wrapper class for the cookie returned when using the
 * {@link PagedResultsControl}.
 * 
 * @author Mattias Hellborg Arthursson
 * @author Ulrik Sandberg
 */
public class PagedResultsCookie {

    private byte[] cookie;

    /**
     * Constructor.
     * 
     * @param cookie
     *            the cookie returned by a PagedResultsResponseControl.
     */
    public PagedResultsCookie(byte[] cookie) {
        if (cookie != null) {
            this.cookie = Arrays.copyOf(cookie, cookie.length);
        } else {
            this.cookie = null;
        }
    }

    /**
     * Get the cookie.
     * 
     * @return the cookie. This value may be <code>null</code>, indicating that there are no more requests,
     * or that the control wasn't supported by the server.
     */
    public byte[] getCookie() {
        if (cookie != null) {
            return Arrays.copyOf(cookie, cookie.length);
        } else {
            return null;
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        PagedResultsCookie that = (PagedResultsCookie) o;

        if (!Arrays.equals(cookie, that.cookie)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return cookie != null ? Arrays.hashCode(cookie) : 0;
    }
}
